US Bridges

Main ST over Otter Brook

Fair

Penobscot County, Maine · 150 Ft N JCT Cram Street · Structure no. 2166

Built
1968
57 years old, rebuilt 1985
Condition
Fair
inspected August 2023
Type
Culvert
Concrete
Length
23 ft
1 main span
Daily traffic
4,152
2016 count
Owner
State
State Highway Agency

About this bridge

Main ST over Otter Brook is a concrete culvert carrying Main ST over Otter Brook in Penobscot County, Maine. It was built in 1968 and reconstructed in 1985, so it is 57 years old, older than the Maine average of 53.7 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 4,152 vehicles a day, roughly 5% of them trucks, projected to reach 5,813 by 2036. The structure is 23 ft (7.1 m) long. If it were closed, the detour would be 26.1 mi (42 km).

Location

Open in Google Maps
CarriesMain ST
CrossesOtter Brook
Location150 Ft N JCT Cram Street
RouteState Highway 178
CountyPenobscot County
StateMaine
Coordinates44.91573, -68.62912
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.9 US tons
Inventory rating30 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1 (+3 approach)
Design loadHS 20 + Mod
Structure length23 ft (7.1 m)
Longest span20 ft (6.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,152 (2016)
Projected traffic5,813 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed26.1 mi (42 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Main ST over Otter Brook built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 1985.

What condition is Main ST over Otter Brook in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2023.

How much traffic does Main ST over Otter Brook carry?

About 4,152 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Main ST over Otter Brook?

The structure is 23 ft (7.1 m) long with a longest span of 20 ft (6.2 m).

Who owns Main ST over Otter Brook?

It is owned by the State Highway Agency.